Aircraft fuel systems Flashcards
What is the purpose of a fuel dump system
In emergency system provided so that the flight crew can quickly bring the weight of the airplane down to the maximum Landing Weight if an emergency occurs during a short takeoff
Other than reducing wait, what other functions can be accomplished with the fuel jettison system
Fuel can be dumped from the heavy wing in order to maintain lateral stability. A fuel dump system is required for all transport airplanes if the maximum take off weight is more than 105% of the maximum Landing Way. The airplane must be free of fire hazards during dumping, and fuel must be free and clear of the airplane
What are a few types of fuel cells
Bladder Fuel cell, integral fuel cell, integral feels tanks, And welded or riveted fuel tanks
How is the weight of the bladder type sell supported
Depends on the structure of the cavity in which it sits to support the weight of fuel within it and maintain the shape of the cell. They are made of either rubber or nylon impregnated with neoprene
What is wet wing construction
When the fuel cells are built into the wing of the aircraft structure using a skin to contain the fuel. They are known as integral fuel cells
What markings must be place near the fuel filter opening on reciprocating engine Aircraft
The words avgas and the minimum fuel grade
What are the advantages of a single point pressure fueling system
Pressure fueling, sometimes referred to as single point or under her wing feeling, and greatly reduces the time required to service large aircraft. It also eliminate Aircraft skin damage from hoses and hose nozzles, and reduces the chance of fuel contamination
After feeling an aircraft, why is it important for a technician to wait at least 30 minutes prior to taking a fuel sample
Turbulence in the tanks, which result in contaminants such as water and solid particles to mix with a fuel.
It is important for the technician to allow enough time for the water and contamination to settle into the sump prior to pulling a fuel sample
Why should a fuel sumps of aircraft be drained before the first flight of the day
To remove any water that has condensed in the fuel and collected in the song
What does water look like when in a fuel that has been drained from the from the dumps
A clear ball of jelly
What is the purpose of a fuel temperature indicator on a turbine engine
It is a means for checking the temperature of the fuel in the tanks at the engine to determine when there may be a danger of ice crystals forming in the fuel
What is the purpose of warning lights in connection with the fuel system
Warning lights maybe used to indicate when fuel pressure is too low, or to indicate when the fuel quantity in the tank is below certain amount
Where are electrical operated valve in transient indicator lights located
On large multi engine aircraft, each of the fuel cross feeds and lines valves may be provided with a valve and transient indicator light. The light is on only during the time the valve is in motion and is off when the movement is complete
Why To feel selectors have detents
So the pilot can feel when the switch is in a specific position
What are for general types of fuel quantity gauges
Sight glass (visual), mechanical (linkage), electrical (transmitter, receiver), and electronica (totalizer)
Which type of fuel quantity gauge is considered to be more accurate than other types
The electronica capacitance type, because it measures by weight
Describe the sensor used in electronica type feel quantity indication systems
It is a two tubular capacitor that extends across the tank from top to bottom
What is a drip cage
Underwing bayonet type fuel gauge that consists of a calibrated hollow Drip tube that is drawn out from the lower wing surface. When the top of the Tube reaches the level of the fuel the two will begin to trip indicating feel level
What is a crossfeed system
Interconnected fuel system designed so that the fuel can be fed from any tank to any engine
What is the purpose of the baffles in a fuel tank
To prevent the fuel from surging as a result of changes in altitude of the aircraft
How can fuel tanks be checked for leaks after repair
By pressure check using air pressure not over 1/2 PSI with liquid soap or bubble solution to identify leaks
